Resawing device.



m. 693,l88. Patented r m n, I902.

E. E. THOMAS.

RESAWING DEVICE.

Application filed Aug. 10, 1901.- I (No Model.) 4 Sheets-Sheet l.

'INVENTOR WWNESSES v E0 mE:THoMAS E B! w 0 P MS'ATTOHNEYS m: uomusPETKRS co.. mofrnlmov. WASNINGYON. 0. cv

N0. 693,!88. Patented Feb. II, I902.

E. E. THOMAS.

BESAWING DEVICE.

(Application filed Aug. 10, 1901.)

(No Model.) 7 4 Sheets-Sheet 2,

INvENT R WWNESSE Enwm E. .THOM A8.

BY W H15 ATTORNEYS m: NORRIS Firms co, PHOTDJJIMQ. WASHINGTON, n. c.

No. s93,|aa. I Patented Feb. u, I902.

E. E. moms. RESAWING DEVICE. (Application filed Aug. 10, 1901.) (NoModel.) 7 4 Sheets-Sheet 3.

WITNESSES lnvsnrroa Eowm E. THOMAS ms ATTORNEYS No. 693188. I PatentedFeb. u I902.

' E. E. THOMAS.

RESAWING DEVICE v (Application filed Aug. 10, 1901.) v (No Model.) -4sheets-sna 4.,

G ilk/MENTOR WIN E. THOMAS- A 1-70 R m :rs.

WITNfELSSES.

1H: scams PEYERS 00,. woYo-ufku. wasulnmou. b c.

UNITED STATES ATENT EEroE,

EDWIN E. THOMAS, OF ST. PAUL, MI NESOTA, ASSIGNOR OF ONE-HALF TO UNIONIRON WORKS, or MINNEAPOLIS, MI ESOTA, A CORPORATION OF MINNESOTA.

sP' c ErcATroN forming part a- Letters Pat nnmeeenss, dated February 11,1902. Applicatiomfiled August 10, 1901.} Serial No. 71,631. (No model.)

To all whom it may concern; w

Be it known that I, EDWIN E. THOMAS, of St. Paul, Ramsey county,Minnesota, have invented certain new and useful Improvements inResawingDevices, of which the following is a specification. y

This invent-ion relates to improvements in band sawing-machines, andparticularly to improvements in that class of machines that are used forresawing lnmberthat is to say,

for splitting lumber that has already been The invention consists,further, in-the constructions and combinations hereinafter described,and particularly pointed ont' in' t-he'l claims." v: I

In the accompanying drawings, forming a part of this specificatiomFigure1 isa plan view of a'portion of a band-saw mill embody-- ingmyinvention. Fig; -2 is a side; elevation of the'same. Figrbisa detailfofthe means for holding the lever carrying the pivotslfor thesway-bar.Figs. 4 and 5 are details of thebridge-tree andsway-bauf Fig. 6isa1ongitudinal section of thesteam-cylinder and its valve. Fig. 7 is aplan viewof' the same.

In the drawings, 2 represents a portion of the frame or baseof aband-sawmill, 3 one of the band-wheels, and4 the band-saw. The feed-rolls 5 5,of which there-aretwo sets or pairs, are. mounted in the slidingbrackets7 and 8. These rolls are carried upon the brack-' ets by theadjustable vbars 9 and 10, and these bars are provided withtheadjusting-screws 11 and 12, bymeans of which the rolls may be adjustedand alined. The shaft of each roll is provided with a "suitablesprocketwheel 13, and the rolls are all driven, preferably, by asprocket-chain 14.

In my present application I make no claim to the means for supporting oradjusting the feed-rolls hereinbefore described nor to the meansfor'driving saidrolls, having shown and described substantially the samemeans in my former application for patent, Serial No. 13,572, filedAugust 20, 1900. I

The bracket 8 is arranged to slide in ways upon the frame of themachine, and the bracket 7 is also arranged to slide in similar ways, sothat the two brackets and the rolls carried by them may be made toapproach toward or recede from each other. One of the brackets, as hereshown the bracket 8, is connected to the piston-rod 15 of asingle-action steam-engine. gle cylinder 16, With a piston 16Ttherein, asteam -chest 17, ports 17" and 17", leading fromthe steam-chest into thecylinder, and a sliding valve 18, provided in's'aid steam-chest,whereby'steam maybe admitted'to' either'side of the'piston from asteam-supplypipe 18'.

end ona stationary support 19, is connected at a point intermediatetoits ends to the valve- This engine consistsof a sin-.

An'lexhaust 18 is provided in one end of the I I steam-chest. A lever18, pivoted near one steml9' and at the end opposite from the support.19is connected to a rod 20, that in turn is connected to a hand-operatedlever 21. A spring 221s provided onthe rod 20,.between a collar22' onsaid rod'anda fixed guidef22 and'this spring normally holds the valve18'f I in the position showninFig. 6,witl1the portbe A 8 .t oppositesideof the piston'op'en tothe exhaust, The steam entering the'cyli-nderbehind the piston forcesit forward andmoves the bracket hind thepistonopen to the live steam and the Sand the rolls carried" thereby towardthe bracket 7;. A 'suitable' stop;23isj arranged between the twobrackets) and prevents the 'v brackets from being moved close--'e'n'o'ngh to. v

each. other to permit therolls to come in con- I tact. The bracket 83 isconnected by a rod 24: to a pivoted sway-bar 26, and the bracket 17 isconnectedby arod 28 to the opposite-end of this bar. The sway-bar beingcentrally pivoted (see Fig. the brackets 7 and 8 will be simultaneouslyand equally moved toward and from each other and with the steam be- 5hind the pistons will be normally held toward each other with a yieldingpressure, and this pressure will be the same whether the rolls are nearthe saw or a considerable distance therefrom. I have found this means IOfor yieldingly holding the rolls toward each other a great improvementover the weight devices ordinarily employed for this purpose, as thepower exerted by the weight is constantly changing,owing to the changeof leverage. I have also found that where the rolls are held together bysteam-pressure behind the piston they are more sensitive and will adaptthemselves more readily to variations in the thickness of the lumber. Byoperating the lever 18 the valve 18 may be moved to the other end of thesteam-chest, opening the port 17 to the exhaust and allowing the steamto flow in ahead of the piston to' force it back and separate the rolls.

The machine is provided with the usual supporting roll or rolls 29, andit may also be provided with the bar 30, supported upon and in front ofone of the brackets, for the purpose of holding the lumber in asubstantially 3o horizontal position and preventing the forward end fromtipping down as the lumber is being fed to the saw. The sway-bar 26 issupported upon the pivoted bridge-tree 31. One end of this bridge-treeis secured upon the pivot 32, andthe opposite end rests upon a bracket33 and is provided with a bolt 34, pivotally connected thereto. Thisbolt passes through suitable openings in the bracket 33 and in a bracket35, and a threaded hand-wheel 36 is arranged upon the bolt 34, betweenthe two brackets 33 and 35. By this means the end of the bridge-tree 31may be adjusted toward or from the feed-rolls, and thereby the pivot ofthe sway-bar may be adjusted toward or 5 from the saw, and the brackets7 and 8 and the rolls may be moved at right angles to the plane of thesaw, so as to bring them into position, with the saw on a central linebetween them.

It sometimes occurs that it is desirable to have one set of the rollsfixed, while the other set is automatically adjustable. I accomplishthis result by changing the pivotal point of thesway-bar from the centerthereof to the end, where the rod 28 from the bracket 7 is connected tosaid sway-bar. This construction is shown in detail in Figs. 3, 4, and 5of thedrawings. As here shown, the sway-bar is pivoted to thebridge-tree centrally by means of the pivot-pin 37. A lever 38 ispivoted upon a projection 39 upon the sway-bar, and the pivot-pin 37 isconnected to said lever by a link 40. A pivot-pin 41 is also provided onthe sway-bar 26 forconnecting the rod 28 to said sway-bar. Thispivot-pin is connected to the lever 38 by the link 42 at the oppositeside of the fulcrum from the connection for the link 40. A hole 43 isprovided in the bridge-tree, and when the pivot-pin 41 is directly overthe hole 43 the lever 38 may be operated to raise the pivot-pin 37 outof the bridge-tree and to force the pivot-pin 41 down into the hole 43in said bridge-tree. This changes the pivotal point of the sway-bar fromthe center of the sway-bar to its end, and the movement of the bracket 8will not now cause any movement of the bracket 7, and the rollssupported by the bracket 7 will remain stationary, while those supportedupon the bracket 8 may be adjustedtoward and from these stationaryrolls. 'When the machine is in operation, ordinarily it will be notedthat the lumber that is passed between the rolls will be sawed throughthe center. If, however, it is desired to saw it at one side of thecenter, the bracket 7 may be fixed in a stationary position in themanner already described, and the lumber may now be sawed at any point,dependent upon the position of the bracket 7. I prefer also to providean automatic device for holding the lever 38 in the desired position. Ashere shown, the sway-bar 26 is provided with the upright 44, againstwhich the side of the lever 38 rests and upon which said lever slides. Abar 45 is arranged parallel with the upright 44 and outside of the lever38. Studs 46 are arranged in the upright 44 and pass through holes inthe bar 45. The ends of these studs are threaded for nuts 47 and areprovided with the springs 48. (See Fig. 3.) Collars 49 are provided onthe studs between the bar 45 and the upright 44, the thickness of thesecollars being less than the thickness of the bar 38. A weight 50 is hungupon the end of the lever 38, and this weight tends to balance thelever, so it will stay where it is put. When the end of the leveropposite that which carries the weight is depressed, the bar 45 willstand in the position shown in Fig. 3, and the lever 38 Will be pinchedbetween the bar and the upright 44 and the lever will be clamped in anyposition in which it may be placed. By raising the end of the lever thepin 37 will be raised out of the bridge-tree and the pin 41 will bepushed down into the bridge-tree and the pivotal point of the sway-barwill be transferred from its center to its end. The bridgetree may thenbe adjusted so as to bring the bracket 7 and the rolls carried therebyinto the desired position, and these rolls will now remain fixed in thisposition, the opposite set of rolls remaining automatically adjustable,as before. If for any reason While the machine is in operation it isdesired to separate the rolls, this may be done through the medium ofthe hand-lever 21, the rod 20, the lever 18, and the valve andvalve-stem connected thereto by admitting steam to the cylinder at theopposite side of the piston, and thereby forcing the piston back intothe cyl- ICC IIO

inder and withdrawing the bracket 8, and when the sway-bar is centrallypivoted simultaneously withdrawing the bracket 7.

It will be obvious that the details of the construction may be modifiedin many particulars without departing from my invention and, ifpreferred, other means than those shown and described may be used foralining and for driving the rolls.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a resawing-machine, thecombination, with a saw,of two sets of feed-rolls, movable brackets whereon said feed-rolls aresupported respectively, a sway-bar pivoted at a -point intermediate toits ends, rods connecting the ends of said bar and said bracketsrespectively, means for moving the pivot of said bar to center the sawwith respect to said rolls, a suitable steam-cylinder provided with apiston and connected to one of said brackets, and a valve normally opento allow steam to enter said cylinder behind said piston,

whereby said rolls will be held toward each other with a yieldingpressure, substantially as described.

2. The combination,with the saw,of two sets of feed-rolls, bracketssupporting said rolls, a pivoted sway-bar connected with each of saidbrackets, and means for changing the pivotal point of said sway-bar tocoincide with its point of connection with one of said brackets,substantially as described.

3. The combination,with the saw,of two sets of feed-rolls, bracketssupporting said rolls, a pivoted sway-bar connected with each of saidbrackets, means for changing the pivotal point of said sway-bar tocoincide with its point of connection with one of said brackets, and asuitable steam-cylinder provided with a piston that is connected to oneof said brackets, substantially as described.

4. The combination,with the feed-rolls and brackets, of the pivotedsway-bar connected with said brackets,the bridge-tree upon which saidsway-bar is supported, the movable pivots, either one of which isadapted to connect said sway-bar to said bridge-tree and onecoincidingwith the point of connection of said bar to one ofsaid'brackets, and means for moving said pivots, substantially asdescribed.

5. In a resawing-machine,the combination,

with a saw, of feed-rolls, movable brackets.

whereon said rolls are supported, a sway-bar pivoted at a pointintermediate to its ends, means connecting said ends respectively withsaid brackets, a bridge tree whereon said sway-bar is supported, saidtree being pivoted at one end, and means for adjusting its opposite endto move the pivot of said sway-bar toward or from the saw, for thepurpose specified.

6. The combination, with the movable brackets and the feed-rolls carriedthereby, of

the pivoted sway-bar connected with each of said brackets, movablepivots either of which is adapted to connect said sway-bar with saidbridge-tree and one coinciding with thepoint of connection of said barto one of said brackets, and a lever for operating said pivots,substantially as described. 2

7. The combination,with the bridge-tree,of

the sway-bar pivoted thereon, the feed-rolls and their movable supportsconnected with said bar, the pivoted lever, the pivot-pins connectedwith said lever, and means for looking said lever, substantially asdescribed.

8. The combination,with the sway-bar, and pivot-pins, of the rolls andtheir movable supports connected with said bar, the movable lever 38,the upright 44, the studs 49, the bar 45 arranged upon said studs, andsprings engaging said bar, substantially as described.

9. In aresawing-machine, the combination, with a saw,of feed-rollsarranged in pairs upon each side of the saw, movable supports for saidrolls, a bar having its ends connected respectively with said supportsand pivoted at an intermediate point to said ends, and means forchanging the pivotal point of said bar to correspond with its point ofconnec tionwith one of said supports, substantially as described.

10. In a resaWing-machine, the combination,withasaw, of bracketsprovided on each side of the same, feed-rolls carried by said brackets,a cylinder having its piston connected with said brackets forsimultaneously moving them toward or from said saw, a valve for saidpiston, an operating-lever, a rod connecting said lever and valve, and aspring provided on said rod and normally holding said valve in an openposition, whereby steam is normally admitted to one side of the pistonICC and tends to move said rolls and brackets toward the plane of thesaw but permits them to yield as the lumber is fed to the saw,substantially as described.

11. In a resawing-machine, the combination, with a saw, of two sets offeed-rolls, movable brackets whereon said feed-rolls are sup portedrespectively, a sway-bar pivoted at an intermediate point to its ends,means con necting the ends of said bar and said brackets respectively, asuitable steam-cylinder having a piston connected to one of saidbrackets, and a valve normally open to allow steam to enter saidcylinder behind said piston, whereby said rolls will be held toward eachother with a yielding pressure, substantially as described. I

12. In a resawing-machine, the combination, with a saw, of thefeed-rolls, movable supports whereon said rolls are arranged, a memberhaving connections respectively with said supports and pivoted at anintermediate point, a fluid-pressure motor having apiston connected withone of said supports, and means for normally allowing pressure to enterlid & 693,188

IO ton connected to one of said supports, and a valve normally open toallow steam to enter said cylinder behind said piston, whereby saidrolls will be held toward each other with a yielding pressure.

In witness whereof I have hereunto set my I5 hand this 7th day ofAugust, 1901.

EDWIN E. THOMAS. In presence of'- RICHARD PAUL, M. E. GooLEY.

